Asp.net core 无法替换ASP.Core 3中的默认JSON协定解析程序

在创建了基于.NETCore3.0框架的基本WebAPI项目之后，所有的API响应都以驼峰的形式出现。我从System.Text.JSON安装了Swashback Swagger+内置JSON序列化程序，具体来说，就是将枚举显示为字符串，一切都和以前一样。然后，我决定切换到NSwag+NewtonSoftJson，因为带有dynamic和expando对象的内置序列化程序存在一些限制。现在，所有API响应都显示在PascalCase中，我既不能更改命名策略，也不能创建自定义契约解析器

示例

问题

我怀疑在幕后可能有包覆盖了合同解析器。如何确保API服务只使用我在启动时分配的自定义协定解析程序，而忽略所有其他类似设置

自定义JSON协定解析器

public class CustomContractResolver : IContractResolver
{
  private readonly IHttpContextAccessor _context;
  private readonly IContractResolver _contract;
  private readonly IContractResolver _camelCaseContract;

  public CustomContractResolver(IHttpContextAccessor context)
  {
    _context = context;
    _contract = new DefaultContractResolver();
    _camelCaseContract = new CamelCasePropertyNamesContractResolver();
  }

  // When API endpoint is hit, this method is NOT triggered

  public JsonContract ResolveContract(Type value)
  {
    return _camelCaseContract.ResolveContract(value);
  }
}

[ApiController]
public class RecordsController : ControllerBase
{
  [HttpGet]
  [Route("services/records")]
  [ProducesResponseType(typeof(ResponseModel<RecordEntity>), 200)]
  public async Task<IActionResult> Records([FromQuery] QueryModel queryModel)
  {
    var response = new ResponseModel<RecordEntity>();

    return Content(JsonConvert.SerializeObject(response), "application/json"); // NewtonSoft serializer
  }
}

控制器

public class CustomContractResolver : IContractResolver
{
  private readonly IHttpContextAccessor _context;
  private readonly IContractResolver _contract;
  private readonly IContractResolver _camelCaseContract;

  public CustomContractResolver(IHttpContextAccessor context)
  {
    _context = context;
    _contract = new DefaultContractResolver();
    _camelCaseContract = new CamelCasePropertyNamesContractResolver();
  }

  // When API endpoint is hit, this method is NOT triggered

  public JsonContract ResolveContract(Type value)
  {
    return _camelCaseContract.ResolveContract(value);
  }
}

[ApiController]
public class RecordsController : ControllerBase
{
  [HttpGet]
  [Route("services/records")]
  [ProducesResponseType(typeof(ResponseModel<RecordEntity>), 200)]
  public async Task<IActionResult> Records([FromQuery] QueryModel queryModel)
  {
    var response = new ResponseModel<RecordEntity>();

    return Content(JsonConvert.SerializeObject(response), "application/json"); // NewtonSoft serializer
  }
}

---

仍然不明白为什么自定义契约解析器不是由API端点触发的，但找到了一个组合，可以让我将API切换到camel案例。请随意解释为什么它是这样工作的

services.AddControllers(o => o.RespectBrowserAcceptHeader = true)

  // Options for System.Text.Json don't affect anything, can be uncommented or removed

  //.AddJsonOptions(o =>
  //{
  //  o.JsonSerializerOptions.Converters.Add(new JsonStringEnumConverter());
  //  o.JsonSerializerOptions.DictionaryKeyPolicy = JsonNamingPolicy.CamelCase;
  //  o.JsonSerializerOptions.PropertyNamingPolicy = JsonNamingPolicy.CamelCase;
  //})

  .AddNewtonsoftJson(o =>
  {
    o.UseCamelCasing(true);
    o.SerializerSettings.Converters.Add(new StringEnumConverter());

    // This option below breaks global settings, so had to comment it

    //o.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver 
    //{
    //  NamingStrategy = new CamelCaseNamingStrategy()
    //};
  });

JsonConvert.DefaultSettings = () => new JsonSerializerSettings
{
  ContractResolver = new CamelCasePropertyNamesContractResolver()
};

这个想法就是从这个角度出发的

---

NewtonSoft允许设置全局序列化设置，而不考虑MVC、Web API和其他框架

这是因为Json.NET作为一个独立的nuget包，有自己的内置全局序列化程序设置，与asp.NET配置不同。asp.net将使用其设置，但当您通过调用

JsonConvert.SerializeObject（response）

直接使用Json.net时，Json.net没有asp.net设置的内置知识，而是使用自己的设置。请参阅：。